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-15+5X=7X+31
We move all terms to the left:
-15+5X-(7X+31)=0
We get rid of parentheses
5X-7X-31-15=0
We add all the numbers together, and all the variables
-2X-46=0
We move all terms containing X to the left, all other terms to the right
-2X=46
X=46/-2
X=-23
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